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27 December, 16:49

The sum of the first 30 terms of the sequence an=6n+5 is

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  1. 27 December, 18:05
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    Sum = n (a₁+an) / 2 where a₁ is the first term, and an is the nth term (30th for this)

    an = 6n+5

    a₁=6 (1) + 5

    =11

    a₃₀=6 (30) + 5

    =185

    Sum = 30 (11+185) / 2

    =15 (196)

    =2940
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